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MTU !! The prefix of this IPv6 address will be advertised to the ISATAP host. IPv6 has some special multicast addresses, which have special meanings. 1/32 ! 6 Image Modified OSPF the AD value !! Define RT value in IPv6 address family Note that at this time, the routing table is used to recursively find the route to 10.1.12.2 ,cisco ccna latest dumps free download, so there must be reachable routes in the routing table. RFC2080 2023::3 Interface ID is 64bits , according to IEEE 's EUI-64 specification 48 -bit MAC address into a 64 -bit interface ID . 00 This way the routing table: Image ! A few notes: Here we use a access-list 1 match 202.101.100.0/24 network, while it with v4v6-pool this IPv6 address pool to do a bundle [Experiment 4 ] There is a main class network; there is a subnet route (match), the longest match --- [Interrupt] In the IPv4 header added by R1 , the protocol field is used to indicate that the upper layer encapsulates the IPv6 packet, and the protocol field value is 41 : Interface FastEthernet0/0 Image Image Ip route 0.0.0.0 0.0.0.0 10.1.12.2 In IPv6 , the determination of the link layer address of a node is done using a combination of NS , NA, and the multicast address of the requested node. This ratio IPv4 's ARP Maximum route entry Interface Serial0/0 ipv6 enable No shutdown interface loopback 0 The address may also represent an interface node or not IP address can be used as the source of some packets IP address (such as the DAD message DHCP initialization process the client's source IP ). For IPv6 node is not acquired IPv6 scene addresses For Windows 7 systems, the IPv6 protocol stack is already installed by default . The configuration of R2 is as follows: The IPV4 address configured in the tunnel is the address of the ISATAP router in the CMD command configured on the corresponding ISATAP host . Our experiment demonstrates that the tunnel directly uses the address of fa0/0 . Of course, the tunnel can also have its own IPv4 address, as long as the ISATAP host can reach the IPv4 address. In addition , the IPv6 address of the tunnel , the corresponding prefix is ​​the prefix to be sent to the ISATAP host later . In this experiment, the IPv6 global unicast address of our tunnel uses the prefix +eui-64 configuration mode, here eui-64 In fact, it refers to the special 64bits interface identifier we introduced earlier .